Example usage for org.antlr.v4.runtime CharStream LA

Introduction

In this page you can find the example usage for org.antlr.v4.runtime CharStream LA.

Prototype

int LA(int i);

Source Link

Document

Gets the value of the symbol at offset i from the current position.

Usage

From source file:com.antsdb.saltedfish.sql.mysql.ExprGenerator.java

License:Open Source License

private static byte[] getBytes(Literal_value_binaryContext rule) {
    Token token = rule.STRING_LITERAL().getSymbol();
    byte[] bytes = new byte[token.getStopIndex() - token.getStartIndex() - 1];
    CharStream cs = token.getInputStream();
    int pos = cs.index();
    cs.seek(token.getStartIndex() + 1);//from w  w w.  ja  va2s.  c o  m
    int j = 0;
    for (int i = 0; i < bytes.length; i++) {
        int ch = cs.LA(i + 1);
        if (ch == '\\') {
            i++;
            ch = cs.LA(i + 1);
            if (ch == '0') {
                ch = 0;
            } else if (ch == 'n') {
                ch = '\n';
            } else if (ch == 'r') {
                ch = '\r';
            } else if (ch == 'Z') {
                ch = '\032';
            }
        }
        bytes[j] = (byte) ch;
        j++;
    }
    cs.seek(pos);
    if (j != bytes.length) {
        // esacpe characters
        byte[] old = bytes;
        bytes = new byte[j];
        System.arraycopy(old, 0, bytes, 0, j);
    }
    return bytes;
}

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From source file:com.antsdb.saltedfish.sql.mysql.MysqlParserFactory.java

License:Open Source License

/**
 * mysql executes statement in a specially formatted comment like
 * / *!40101 SET NAMES utf8 * /;/*from  w ww.ja  v a  2  s.c  om*/
 * @param cs
 * @return
 */
private static boolean isCommtedStatement(CharStream cs) {
    int idx = cs.index();
    if (cs.LA(idx + 1) != '/') {
        return false;
    }
    if (cs.LA(idx + 2) != '*') {
        return false;
    }
    if (cs.LA(idx + 3) != '!') {
        return false;
    }
    if (cs.LA(idx + 4) != '4') {
        return false;
    }
    return true;
}

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From source file:net.certiv.json.test.base.AbstractBase.java

License:Open Source License

public List<String> getTokenTypes(LexerGrammar lg, ATN atn, CharStream input) {
    LexerATNSimulator interp = new LexerATNSimulator(atn,
            new DFA[] { new DFA(atn.modeToStartState.get(Lexer.DEFAULT_MODE)) }, null);
    List<String> tokenTypes = new ArrayList<String>();
    int ttype;//from   www.j a v a  2 s .  c  o  m
    boolean hitEOF = false;
    do {
        if (hitEOF) {
            tokenTypes.add("EOF");
            break;
        }
        int t = input.LA(1);
        ttype = interp.match(input, Lexer.DEFAULT_MODE);
        if (ttype == Token.EOF) {
            tokenTypes.add("EOF");
        } else {
            tokenTypes.add(lg.typeToTokenList.get(ttype));
        }

        if (t == IntStream.EOF) {
            hitEOF = true;
        }
    } while (ttype != Token.EOF);
    return tokenTypes;
}

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